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      04-HTML标签：排版标签
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<h2 id="本文主要内容"><a href="#本文主要内容" class="headerlink" title="本文主要内容"></a>本文主要内容</h2><p>排版标签：</p>
<ul>
<li><p><code>&lt;h1&gt;</code></p>
</li>
<li><p><code>&lt;p&gt;</code></p>
</li>
<li><p><code>&lt;hr /&gt;</code></p>
</li>
<li><p><code>&lt;br /&gt;</code></p>
</li>
<li><p><code>&lt;div&gt;</code></p>
</li>
<li><p><code>&lt;span&gt;</code></p>
</li>
<li><p><code>&lt;center&gt;</code></p>
</li>
<li><p><code>&lt;pre&gt;</code></p>
</li>
</ul>
<p>下面来详细介绍一下排版标签。</p>
<h2 id="标题标签"><a href="#标题标签" class="headerlink" title="标题标签"></a>标题标签</h2><p>标题使用<code>&lt;h1&gt;</code>至<code>&lt;h6&gt;</code>标签进行定义。<code>&lt;h1&gt;</code>定义最大的标题，<code>&lt;h6&gt;</code>定义最小的标题。具有align属性，属性值可以是：left、center、right。</p>
<p>代码举例：</p>
<pre class="highlight"><span class="line"><span class="meta">&lt;!DOCTYPE <span class="keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">lang</span>=<span class="string">&quot;en&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span> <span class="attr">content</span>=<span class="string">&quot;width=device-width, initial-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">title</span>&gt;</span>Document<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h1</span>&gt;</span>H1：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h2</span>&gt;</span>H3：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h3</span>&gt;</span>H3：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h4</span>&gt;</span>H4：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h5</span>&gt;</span>H5：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h5</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h6</span>&gt;</span>H6：千古壹号，永不止步<span class="tag">&lt;/<span class="name">h6</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br><span class="line"></span><br></pre>

<p>效果演示：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/20200402_1050.png" class="lozad post-image"src="http://img.smyhvae.com/20200402_1050.png"></p>
<h2 id="HTML-注释"><a href="#HTML-注释" class="headerlink" title="HTML 注释"></a>HTML 注释</h2><p>HTML 注释的格式如下：</p>
<pre class="highlight"><span class="line"><span class="comment">&lt;!-- 我是 html 注释  --&gt;</span></span><br></pre>

<h2 id="段落标签-lt-p-gt"><a href="#段落标签-lt-p-gt" class="headerlink" title="段落标签&lt;p&gt;"></a>段落标签<code>&lt;p&gt;</code></h2><p>段落，是英语“paragraph“缩写。</p>
<p><strong>作用</strong>：可以把 HTML 文档分割为若干段落。在网页中如果要把文字有条理地显示出来，离不开段落标签。就如同我们平常写文章一样，整个网页也可以分为若干个段落。</p>
<p>代码举例：</p>
<pre class="highlight"><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span>This is a paragraph<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span>This is another paragraph<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br></pre>

<p>属性：</p>
<ul>
<li><code>align=&quot;属性值&quot;</code>：对齐方式。属性值包括left center right。</li>
</ul>
<p>属性举例：</p>
<p><img src="http://img.smyhvae.com/2015-10-01-cnblogs_html166440-1dcd2ad6e6353559.png" alt="Paste_Image.png" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html166440-1dcd2ad6e6353559.png" class="lozad post-image"></p>
<p>HTML标签是分等级的，HTML将所有的标签分为两种：</p>
<ul>
<li><p><strong>文本级标签</strong>：p、span、a、b、i、u、em。文本级标签里只能放<strong>文字、图片、表单元素</strong>。（a标签里不能放a和input）</p>
</li>
<li><p><strong>容器级标签</strong>：div、h系列、li、dt、dd。容器级标签里可以放置任何东西。</p>
</li>
</ul>
<p>从学习p的第一天开始，就要牢牢记住：<strong>p标签是一个文本级标签，p里面只能放文字、图片、表单元素</strong>。其他的一律不能放。</p>
<p>错误写法：（尝试把 h 放到 p 里）</p>
<pre class="highlight"><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span></span><br><span class="line">	我是一个小段落</span><br><span class="line">	<span class="tag">&lt;<span class="name">h1</span>&gt;</span>我是一级标题<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br></pre>

<p>网页效果如下：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/20170630_1102.png" class="lozad post-image"src="http://img.smyhvae.com/20170630_1102.png"></p>
<p>上图显示，浏览器不允许你这么做，我们使用Chrome的F12审查元素发现，浏览器自己把p封闭掉了，不让你去包裹h1。</p>
<p>PS：Chrome浏览器是HTML5支持度最好的浏览器。提供了非常好的开发工具，非常适合我们开发人员使用。审查元素功能的快捷键是F12。</p>
<h2 id="水平线标签-lt-hr-gt"><a href="#水平线标签-lt-hr-gt" class="headerlink" title="水平线标签&lt;hr /&gt;"></a>水平线标签<code>&lt;hr /&gt;</code></h2><blockquote>
<p>horizontal 单词的发音：[ˌhɒrɪˈzɒntl]。</p>
</blockquote>
<p>水平分隔线（horizontal rule）可以在视觉上将文档分隔成各个部分。在网页中常常看到一些水平线将段落与段落之间隔开，使得文档结构清晰，层次分明。</p>
<p>代码举例：</p>
<pre class="highlight"><span class="line"><span class="meta">&lt;!DOCTYPE <span class="keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">lang</span>=<span class="string">&quot;en&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span> <span class="attr">content</span>=<span class="string">&quot;width=device-width, initial-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">title</span>&gt;</span>Document<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">p</span>&gt;</span>自古情深留不住<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">hr</span> /&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">p</span>&gt;</span>总是套路得人心<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre>

<p>运行效果：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/20200401_1930.png" class="lozad post-image"src="http://img.smyhvae.com/20200401_1930.png"></p>
<p>属性介绍：</p>
<ul>
<li><code>align=&quot;属性值&quot;</code>：设定线条置放位置。属性值可选择：left right center。</li>
<li><code>size=&quot;2&quot; </code>：设定线条粗细。以像素为单位，内定为2。</li>
<li><code>width=&quot;500&quot;</code>或<code>width=&quot;70%&quot;</code>：设定线条长度。可以是绝对值（单位是像素）或相对值。如果设置为相对值的话，内定为100%。</li>
<li><code>color=&quot;#0000FF&quot;</code>：设置线条颜色。</li>
<li><code>noshade</code>：不要阴影，即设定线条为平面显示。若没有这个属性则表明线条具阴影或立体。</li>
</ul>
<p>属性效果演示：</p>
<p><img src="http://img.smyhvae.com/2015-10-01-cnblogs_html_05.png" alt="Paste_Image.png" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html_05.png" class="lozad post-image"></p>
<h2 id="换行标签-lt-br-gt"><a href="#换行标签-lt-br-gt" class="headerlink" title="换行标签&lt;br /&gt;"></a>换行标签<code>&lt;br /&gt;</code></h2><p>如果希望某段文本强制换行显示，就需要使用换行标签。</p>
<pre class="highlight"><span class="line">This <span class="tag">&lt;<span class="name">br</span>/&gt;</span> is a para<span class="tag">&lt;<span class="name">br</span>/&gt;</span>graph with line breaks</span><br></pre>
<p>效果如下：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html03.png" class="lozad post-image"src="http://img.smyhvae.com/2015-10-01-cnblogs_html03.png"></p>
<h2 id="lt-div-gt-和-lt-span-gt-标签"><a href="#lt-div-gt-和-lt-span-gt-标签" class="headerlink" title="&lt;div&gt;和&lt;span&gt;标签"></a><code>&lt;div&gt;</code>和<code>&lt;span&gt;</code>标签</h2><p>div和span是非常重要的标签，div的语义是division“分割”； span的语义就是span“范围、跨度”。想必你应该听说过“div + css”布局。</p>
<h3 id="div和span的介绍"><a href="#div和span的介绍" class="headerlink" title="div和span的介绍"></a>div和span的介绍</h3><ul>
<li><p><strong>div标签</strong>：可以把标签中的内容分割为独立的区块。必须单独占据一行。</p>
</li>
<li><p><strong>span标签</strong>：和div的作用一致，但不换行。</p>
</li>
</ul>
<p>代码举例：</p>
<p><img src="http://img.smyhvae.com/2015-10-01-cnblogs_html_08.png" alt="Paste_Image.png" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html_08.png" class="lozad post-image"></p>
<p>div标签的属性：</p>
<ul>
<li><code>align=&quot;属性值&quot;</code>：设置块儿的位置。属性值可选择：left、right、 center。</li>
</ul>
<h3 id="div和span的区别"><a href="#div和span的区别" class="headerlink" title="div和span的区别"></a>div和span的区别</h3><p><code>&lt;span&gt;</code>和<code>&lt;div&gt;</code>唯一的区别在于：<code>&lt;span&gt;</code>是不换行的，而<code>&lt;div&gt;</code>是换行的。</p>
<p>如果单独在网页中插入这两个元素，不会对页面产生任何的影响。这两个元素是专门为定义CSS样式而生的。或者说，DIV+CSS来实现各种样式。</p>
<p>div在浏览器中，默认是不会增加任何的效果的，但是语义变了，div中的所有元素是一个小区域。<br>div标签是一个<strong>容器级</strong>标签，里面什么都能放，甚至可以放div自己。</p>
<p>span也是表达“小区域、小跨度”的标签，但只是一个<strong>文本级</strong>的标签。<br>就是说，span里面只能放置文字、图片、表单元素。 span里面不能放p、h、ul、dl、ol、div。</p>
<p>span举例：</p>
<pre class="highlight"><span class="line"><span class="tag">&lt;<span class="name">p</span>&gt;</span></span><br><span class="line">	简介简介简介简介简介简介简介简介</span><br><span class="line">	<span class="tag">&lt;<span class="name">span</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;&quot;</span>&gt;</span>详细信息<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;&quot;</span>&gt;</span>购买<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"></span><br></pre>

<p>div举例：</p>
<pre class="highlight"><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;header&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;logo&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;nav&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;content&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;guanggao&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;dongxi&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;footer&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre>

<p>我们亲切地称这种模式叫做“<strong>div+css</strong>”：<strong>div标签负责布局、结构、分块，css负责样式</strong>。</p>
<h2 id="内容居中标签-lt-center-gt"><a href="#内容居中标签-lt-center-gt" class="headerlink" title="内容居中标签 &lt;center&gt;"></a>内容居中标签 <code>&lt;center&gt;</code></h2><p>此时center代表是一个标签，而不是一个属性值了。只要是在这个标签里面的内容，都会居于浏览器的中间。<br>效果演示：</p>
<p><img src="http://img.smyhvae.com/2015-10-01-cnblogs_html_06.png" alt="Paste_Image.png" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html_06.png" class="lozad post-image"></p>
<p>到了HTML5里面，center标签不建议使用，建议使用css布局来实现。</p>
<h2 id="预定义（预格式化）标签-lt-pre-gt"><a href="#预定义（预格式化）标签-lt-pre-gt" class="headerlink" title="预定义（预格式化）标签&lt;pre&gt;"></a>预定义（预格式化）标签<code>&lt;pre&gt;</code></h2><p>含义：将保留标签内部所有的空白字符(空格、换行符)，原封不动地输出结果（告诉浏览器不要忽略空格和空行）。</p>
<p>说明：真正排网页过程中，<code>&lt;pre&gt;</code>标签几乎用不着。<br>效果演示：</p>
<p><img src="http://img.smyhvae.com/2015-10-01-cnblogs_html_07.png" alt="Paste_Image.png" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="http://img.smyhvae.com/2015-10-01-cnblogs_html_07.png" class="lozad post-image"></p>
<h2 id="我的公众号"><a href="#我的公众号" class="headerlink" title="我的公众号"></a>我的公众号</h2><p>想学习<strong>更多技能</strong>？不妨关注我的微信公众号：<strong>千古壹号</strong>（id：<code>qianguyihao</code>）。</p>
<p>扫一扫，你将发现另一个全新的世界，而这将是一场美丽的意外：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="https://img.smyhvae.com/20200102.png" class="lozad post-image"src="https://img.smyhvae.com/20200102.png"></p>

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